source: 2.3/menu/util.c@ fd48886

/*
 * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
 * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
 *
 * Released under the terms of the GNU GPL v2.0.
 */

#include <string.h>
#include "lkc.h"

/* file already present in list? If not add it */
struct file *file_lookup(const char *name)
{
        struct file *file;

        for (file = file_list; file; file = file->next) {
                if (!strcmp(name, file->name))
                        return file;
        }

        file = malloc(sizeof(*file));
        memset(file, 0, sizeof(*file));
        file->name = strdup(name);
        file->next = file_list;
        file_list = file;
        return file;
}

/* write a dependency file as used by kbuild to track dependencies */
int file_write_dep(const char *name)
{
        struct file *file;
        FILE *out;

        if (!name)
                name = ".config.cmd";
        out = fopen(".config.tmp", "w");
        if (!out)
                return 1;
        fprintf(out, "deps_config := \\\n");
        for (file = file_list; file; file = file->next) {
                if (file->next)
                        fprintf(out, "\t%s \\\n", file->name);
                else
                        fprintf(out, "\t%s\n", file->name);
        }
        fprintf(out, "\n.config include/config.h: $(deps_config)\n\n$(deps_config):\n");
        fclose(out);
        rename(".config.tmp", name);
        return 0;
}


/* Allocate initial growable sting */
struct gstr str_new(void)
{
        struct gstr gs;
        gs.s = malloc(sizeof(char) * 64);
        gs.len = 16;
        strcpy(gs.s, "\0");
        return gs;
}

/* Allocate and assign growable string */
struct gstr str_assign(const char *s)
{
        struct gstr gs;
        gs.s = strdup(s);
        gs.len = strlen(s) + 1;
        return gs;
}

/* Free storage for growable string */
void str_free(struct gstr *gs)
{
        if (gs->s)
                free(gs->s);
        gs->s = NULL;
        gs->len = 0;
}

/* Append to growable string */
void str_append(struct gstr *gs, const char *s)
{
        size_t l = strlen(gs->s) + strlen(s) + 1;
        if (l > gs->len) {
                gs->s   = realloc(gs->s, l);
                gs->len = l;
        }
        strcat(gs->s, s);
}

/* Append printf formatted string to growable string */
void str_printf(struct gstr *gs, const char *fmt, ...)
{
        va_list ap;
        char s[10000]; /* big enough... */
        va_start(ap, fmt);
        vsnprintf(s, sizeof(s), fmt, ap);
        str_append(gs, s);
        va_end(ap);
}

/* Retreive value of growable string */
const char *str_get(struct gstr *gs)
{
        return gs->s;
}